How to check noise in WLC??

[JustTakeTheFirstStep]

How to check noise in WLC??

[balaji.bandi]

not sure what version WLC running and what model some guidance :

https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-7/config-guide/b_cg87/radio_resource_management.html

https://mrncciew.com/2013/03/16/rrm-basics/

[JustTakeTheFirstStep]

Is there a way to check the noise floor from CLI or GUI??

[balaji.bandi]

I have provided the guide to check in GUI (did you get chance to look ?)

[JustTakeTheFirstStep]

Sorry. I did not understand the guide because I am not familiar with English.

Can you briefly explain the menu for checking the noise?

[Arshad Safrulla]

If you need realtime readings you need to have Cisco Spectrum Expert(application to be installed) and you need to have Clean Air or RF ASIC capable AP's to do that. 

Alternatively from WLC you can check by command  "show ap auto-rf dot1124ghz/5ghz"

[patoberli · Accepted solution]

If you have a WLC based WLC (Cisco 5520, 3504, ...) and not an IOS XE based one, then you find it for example here in the GUI per Access Point:

[RxTx]

Has anyone encountered the situation in the picture?
Noise not available?
I'm trying to figure out under what conditions it is not available/displayed; maybe some threshold value -110 ?
- vWLC 8.10.196.0 and AP-3702 have been restarted for 2 days and have Rogue detection disabled, all other 6x 3702 AP's display Noise correctly.
- SSID has Scan Defer Time(msecs) 1000

[Scott Fella]

Since you arleady rebooted the ap, I would check if clients can actually connect to the ap on both bands to make sure the ap is at least functioning.  I would then maybe factory reset the ap using the mode button and see if that helps or not.  There should be no difference between any of your other 3702's, so it looks like it might be isolated to that ap.  You can also swap it with another ap in a different location to see what happens.  That might also help you get an idea.  Do you have any tools like a NetAlly or Ekahau that you can use to also gather data?

[RxTx]

Hi Scott,

All my AP's are working without any problem on FlexConnect Local Switching & FlexConnect Local Auth with 2xSSID and 2xRF profiles and all clients on that specific AP in 2.4GHz ( 12-15 clients ) and 5GHz ( 2-3 clients ) are happy, no other problems just that things I noticed, that can be also some bug on vWLC sw.

I will try to reboot that AP at some point or to replace it with another one from my stock just to see if it change anything.

In fact that AP replaced another one that have installed extension module AIR-RM3010L-E-K9 because I did some test comparing with one dedicated 3702 in monitoring mode in close proximity and my conclusion was that extension module induce some level of noise on AP and the reporting parameters can't be trusted so it is better to use them without extension module.

[RxTx]

And the funny thing is: on Cisco Spectrum Expert it look OK:

The average it is under -110dBm:

[Scott Fella]

I wouldn't worry about it then, however, factory reset the ap might help, but I wouldn't really worry too much about that.  You have six ap's and always use the spectrum expert for validation.  Have you tried to search the issue in the bug tool kit?  If that doesn't have anything, you can always open a TAC case and see if they find anything that might not be visible to the public.

[RxTx]

I will keep an eye on the AP because it is interesting, as I have seen this AP once, it displays noise, and another time it does not display, so at this point I believe the vWLC sw will not display noise below -110- 115 dBm (maybe others can check their WLC to confirm).

p.s

I did not search for bugs yet and not ask for TAC help as vWLC sw it is obsolete.

[Scott Fella]

I understand.  That is also why I mentioned to swap the ap to a different location for like a few days.  That will provide you with data is the ap itself not sending the info, or that area is indeed very clean.